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Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
DESCRIPTION
PT2308P is a 2 channel Class AB stereo speaker driver utilizing CMOS technology designed by AB push-pull, the original sound will be low distortion amplify and low consumption. The power of PT2308P will be reach 300mW on THD=10% and deliver 8 load.
FEATURES
Wild operating temperature large Excellent Power Signal-to-Noise Repel Rate (PSRR) Low static state current consumption Output power (THD=10) - Load is 16/190mW - Load is 8/300mW * Low harmonics distortion (THD=0.03%) * Large output amplitude * * * *
APPLICATIONS
* * * * Walkman Portable audio HI-FI audio system CD-ROM
PT2308P V1.0
-1-
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
BLOCK DIAGRAM
OUT 1 1 IN1- 2 IN1+ 3 VS S 4 OP1 + 8 VDD 7 OUT 2 OP2 + 6 IN25 IN2+
PT2308P V1.0
-2-
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
PIN CONFIGURATION
OUT 1 IN1IN1+ VS S 1 2 3 4 PT 2308P 8 7 6 5 VD D OUT 2 IN2IN2+
PIN DESCRIPTION
Pin Name OUT1 IN1IN1+ VSS IN2+ IN2OUT2 VDD I/O O I I I I O Description Output pin 1 Inverting input pin 1 Non-inverting input pin 1 Negative power supply Non-inverting input pin 2 Inverting input pin 2 Output pin 2 Positive power supply Pin No. 1 2 3 4 5 6 7 8
PT2308P V1.0
-3-
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
BASIC APPLICATION DESCRIPTION
PT2308P is a low power amplifier which operates with a 5V input voltage, it can be used to drive regular earphones or low power speakers with a load resistance of 8ohm or higher. The operation mechanics is much like the typical OPAMP. (The picture below shows the basic application circuit of PT2308P as an inverted amplifier).
R2
Vin
Ci
R1
Co
Vout
VREF Show in one side R3 RL
PT2308P Typical Application Circuit
1. Gain Settings The inverted amplifier's amplification is equal to the ratio between R2 and R1 (Av= -(R2/R1)). Please take note that the maximum supply voltage for the PT2308P is 5V, voltage gain setting should depend on the input level amplitude; too much voltage gain may increase the chance of causing clipping at the output. 2. VREF Because the PT2308P operates with a single power source, to ensure the best output performance, the suggested value for VREF is 1/2 VDD.
PT2308P V1.0
-4-
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
3. Input Coupling Capacitor Ci In typical applications, this input coupling capacitor transfers signals between the input and PT2308P, it allows block DC bias of the PT2308P flowing into input signal, and thus the user must be aware of the voltage tolerance and the polarity of this Cap. Referring to the diagram above, Ci and R1 forms a 1st order high-pass filter; the lower-cutoff frequency is determined by the equation: fc(highpass)=1/2R1Ci The diagram below shows the frequency response when: Ci=10F/1F/0.47F/0.22F/0.1F
PT2308P V1.0
-5-
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
4. Output Coupling Capacitor Co Single power single-ended (SE) configuration generates a DC bias at the output of the amplifier; a coupling capacitor must be placed at the output to block the DC bias from being sent to the load and connect a RL at the signal output terminal. The low cut-off frequency may be needs to adjust to correspond to different load (speaker or earphone) specifications. Similar to the input coupling capacitor, the output coupling capacitor and impedance of the load form a 1st order high-pass filter, the low cut-off frequency is determined by the equation: fc(highpass)=1/2RLCo The diagram below shows the frequency response when: Co=1000F/470F/220F/100F.
5. Discharging Resistor (R3) When the PT2308 is powered ON, the output coupling capacitor Co will start charging. When there is no load connected at Vout, there will be a DC voltage present. At this time, if a load is suddenly connected (usually earphone or speaker for general applications), the charged Co will then discharge through Vout to the load, causing a very loud popping sound, thus, it is recommended to connect a R3 to regulate the discharge of Co. The time it takes to discharge is T=CoR3. The recommended resistance value for R3 is between 1K ~ 10K, to prevent loading effect from the amplifier. If the load (ex. Speaker) is permanently connected then R3 can be neglected.
PT2308P V1.0
-6-
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
ABSOLUTE MAXIMUM RATING
Parameter Supply voltage Operating temperature Storage temperature Symbol VDD Topr Tstg Rating 8 -40+85 -65+150 Unit V
ELECTRONICAL CHARACTERISTICS
(Unless otherwise specified, VDD=5V, VSS=0V, Ta=25, fin=1KHz, RL=8) Parameter Symbol Condition Min. Supply voltage VDD 2.7 Supply current IDD No Load Input offset VI(OS) voltage Total harmonic PO=200mW, RL=8, F=1KHZ THD+N distortion PO=120mW, RL=16, F=1KHZ THD=0.2%, f=1KHz, RL=8 200 Maximum THD=0.2%, f=1KHz, RL=16 100 PO Output Power THD=10%, f=1KHz, RL=8 250 THD=10%, f=1KHz, RL=16 160 Output noise VN VDD=3V Supply current IDD No Load Input offset VI(OS) voltage Total harmonic PO=50mW, RL=8, F=1KHZ THD+N distortion PO=40mW, RL=16, F=1KHZ THD=0.2%, f=1KHz, RL=8 60 Maximum THD=0.2%, f=1KHz, RL=16 40 PO output power THD=10%, f=1KHz, RL=8 70 THD=10%, f=1KHz, RL=16 55 Output noise VN Typ. 5 3 5 0.04 0.03 250 130 300 190 20 2 5 0.02 0.02 80 50 100 70 20 Max. 5.5 4 50 0.1 0.06 50 3 50 0.05 0.05 50 Unit V mA mV % % mW mW mW mW V mA mV % % mW mW mW mW V
PT2308P V1.0
-7-
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
APPLICATION CIRCUIT
VIN 1 2.2uF 15K 15K 220uF RL VOUT 1
4
3
2
1
VSS
GND
VREF (typ. 1/2VDD)
PT2308P
VDD
5 6 7 8
100uF VDD
VIN 2 2.2uF 15K 15K 220uF RL
VOUT 2
PT2308P V1.0
-8-
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
ORDER INFORMATION
Valid Part Number PT2308P-S PT2308P-S (L) Package Type 8 Pins, SOP, 150mil 8 Pins, SOP, 150mil Top Code PT2308P-S PT2308P-S
Notes: 1. (L), (C) or (S) = Lead Free. 2. The Lead Free mark is put in front of the date code.
PT2308P V1.0
-9-
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
PACKAGE INFORMATION
8PINS, SOP, 150MIL
PT2308P V1.0
- 10 -
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
PT2308P
PT2308P V1.0
- 11 -
November, 2005
Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw
2-Channel 300mW Class AB Power Amplifier
Symbol A A1 A2 b b1 c c1 D E E1 e L L1 L2 R R1 h 1 2 Min. 1.35 0.10 1.25 0.31 0.28 0.17 0.17 Typ. 4.90 BSC. 6.00 BSC. 3.90 BSC. 1.27 BSC. 1.04 REF. 0.25 BSC. Max. 1.75 0.25 1.65 0.51 0.48 0.25 0.23
PT2308P
0.40 0.07 0.07 0.25 0 5 0
1.27 0.50 8 15 -
Notes: 1. Dimensioning and tolerancing per ANSI Y 14.5M-1994 2. Controlling Dimension: MILLIMETERS. 3. Dimension D does not include mold flash protrusions or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.15 mm (0.006 in) per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.25mm per side. D and E1 dimensions are determined at datum H. 4. The package top may be smaller than the package bottom. Dimensions D and E1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 5. Datums A & B to be determined at datum H. 6. N is the number of terminal positions. (N=8) 7. The dimensions apply to the flat section of the lead between 0.10 to 0.25mm from the lead tip. 8. Dimension "b" does not include dambar protrusion. Allowable dambar protrusion shall be 0.10mm total in excess of the "b" dimension at maximum material condition. The dambar cannot be located on the lower radius of the foot. 9. This chamfer feature is optional. If it is not present, then a pin 1 identifier must be located within the index area indicated. 10. Refer to JEDEC MS-012, Variation AA. JEDEC is the registered trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.
PT2308P V1.0 - 12 November, 2005

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